1. A 35-kg crate rests on a horizontal floor, and a 65-kg person is standing on the crate. Determine the magnitude of the normal force that (a) the floor exerts on the crate and (b) the crate exerts on the person.

5. A person stands on a scale in an elevator. As the elevator starts, the scale has a constant reading of 591 N. As the elevator later stops, the scale reading is 391 N. Assuming the magnitude of the acceleration is the same during starting and stopping, determine (a) the weight of the person, and (b) the acceleration of the elevator.

/--/ A mass is suspended as shown in the diagram, with M = 18 kg and 0₂ = 28. Find the three tensions. 0₂ T₁ 15. T₁ A. 331.8 N 337.1 N ن کو ہے B. C. 293_N 1-1 16. T₂ A. B. C. /--/ 469.9 N 375.7 N 276.9 N T₂ T₁ M D. 73.3 N E. 504.1 N F. 515.3 N D. 346.4 N E. 297.5 N F. 304.8 N

1) A 75-kg crane is suspended through a frictionless pulley to a massless pole at two points, each point is an end of two cables, and the left cable has an angle to the pole of 25 degrees while that of the right angle has an angle of 15 degrees. Each cable passes over a frictionless pulley. What is the tension force of the left cable? What is the tension force of the right cable?   Draw a free-body diagram of the problem.  Identify the known information.  Identify the unknown information.  Write the equations to solve for the unknown information.  Calculate.  Encircle your final answer with the appropriate units.

4. It takes 59 N of horizontal force to just get a 22 kg suitcase just starting to move across a floor.  Determine the coefficient of friction.  please hand write it clearly.

1. A ping-pong ball has a weight of 0.50 N. While in contact with a paddle the paddle exerts a force of 7.8 N at 29° above the horizontal. Determine the net force acting on the ball at this instant.

A block of mass m1 rests on horizontal ground. A block of mass m2 rests on m1. There is no friction between m1 and the ground. There is friction only between m2 and m1. A horizontal force of magnitude F is then applied to m1   Consider the statments: I) the friction force on m2 is to the right. II) suppose that F is small enough for the two blocks to move with the same acceleration a>0. In this case, the friction force is static. III) suppose that F is large enough for the two blocks to move with different accelerations. In this case, the acceleration of m2 relative to the ground is to the left.   Which of them are true?

3. If I push my stalled car to the West with 500 N of force, but I don't get it to move, (a) How much frictional force must exist between the tires and the ground for me not to be able to move the car? (b) In what direction is the frictional force acting ? (c) Which type of frictional force is occurring here (kinetic or static)?

1. A block of mass 3.00-kg is pushed against a wall by a force P that makes an angle of 50.00 with the horizontal as shown in the figure below. The coefficient of static friction between the block and the wall is 0.250. Determine the possible values for the magnitude of P that allow the block to remain stationary.

37. A suitcase with mass 18 kg is pulled at a constant speed by a handle that makes an angle θ with the horizontal. The frictional force on the suitcase is 27 N and the force applied on the handle is 43 N. (a) Determine the value of the angle, θ. (b) Determine the normal force exerted on the suitcase.